Science : Ch 11 – The Human Eye and the Colourful World

At noon, the Sun looks white as:

A clear sky appears blue, because:

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light:

Which of the following phenomena contributes signifcantly to the reddish appearance of the sun at sunrise or sunset?

The bluish colour of water in deep sea is due to:

Power of a lens is the measure of the degree of

Arpit remarked that he has seen wavering of objects when seen through a stream of hot air rising above a tandoor or a fire. He said that the air just above the fire becomes hotter than the air further higher up. He further said that this wavering can also be seen in the earth’s atmosphere as the earth’s atmosphere is not evenly distributed ,What is the total time diference on duration of day on earth?

Milk is a colloid that contains globules of fat and protein. When a beam of light is directed at a glass of milk the light is scattered. That is a great example

When a fine beam of sunlight enters a smoke filled room, smoke particles become visible due to scattering of light by these particles

Why is red used as the stopping light at traffic signals?

The sky appears black to an astronaut

The SI unit of Power of a lens is

The colour of scattered light depends on the

The sky appears black to an astronaut as there is no

Visible spectrum is the band of coloured components of a